65
DIRECT VENT TERMINATION CLEARANCES
GENERAL VENTING REQUIREMENTS AND
GUIDELINES
Figure 32 shows minimum clearances that must be used for direct venting terminations.
FIGURE 32
DIRECT VENT TERMINAL CLEARANCES
K
D
E
L
B
C
F
G
A
B
J
A
M
I
H
INSIDE CORNER
DETAIL
VENT TERMINAL
AIR SUPPLY INLET
AREA WHERE TERMINAL
IS NOT PERMITTED
Fixed
Closed
Operable
B
Fixed
Closed
Operable
B
B
A = Clearance above grade, veranda, porch, deck
or balcony
B = Clearance to window or door that may be opened
C = Clearance to permanently closed window
D = Vertical clearance to ventilated soffit located above the
terminal within a horizontal distance of 2 feet (0.6m)
from the center line of the terminal
E = C
learance to unventilated soffit
F = Clearance to outside corner
G = Clearance to inside corner
H = Clearance to each side of center line extended above
mete
r / regulator assembly
I = Clearance to service regulator vent outlet
J = &OHDUDQFHWRQRQíPHFKDQLFDODLr supply inlet to building
or the combustion air inlet to any other appliance
K = Clearance to me
chanical air supply inlet
L = Clearance above paved sidewalk or paved driveway
located on public property
M = Clearance under veranda, porch, deck or
balcony
US Installations
1
Canadian Installations
2
12 inches (305mm) or 12 in. 305mm)
above average snow accumulation.
6 inches (15cm) for appliances<10,000 Btuh (3kw),
12 inches (305mm) for appliances >10,000 B
tuh (3kw),
and<100,000 Btuh (30kw),
36 inches (.9m) for appliances > 100,000 Btuh (30kw)
* 12" (30cm)
* 3 ft. (.9m), 10 ft. (3.05 m) preferred
* 7 feet (2.
1m)
3 feet (.9m) within a height 15 feet (4.5m) above the
meter / regulator assembly
*3 feet (.9m)
6 inches (15cm) for appliances <10,000Btuh (3kw),
12 inches (30cm) fo
r appliances > 10,000 Btuh (3kw)
and<100,000 Btuh (30kw),
36 inches (.9m)for appliances > 100,000 Btuh (30kw)
3 feet (.9m) above if within 10 feet (3m)
hor
izontally
6 feet (1.8m)
1
In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code
2
In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code
*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA B149.1, cleara
nce
will be in accordance with local installation codes and the requirements of the gas
supplier and these installation instructions."
* 12" (30cm)
* Equal to or greater than soffit depth * 3 ft. (0.9m)
* Equal to or greater than soffit depth
* No minimum to outside corner* No minimum to outside corner
3 feet (.9m) within a
height 15 feet (4.5m)
above the meter / regulator assembly
3 feet (.9m)*
† Vent shall not terminate less than 7 ft. (2.1m) above a paved sidewalk or paved driveway
that is located on public property.
‡ Permitted only if veranda, porc
h, deck or balcony is full open on a minimum of two sides
beneath the floor. We reccommend avoiding this location if possible.
* 2 ft. (0.6m)
* 3 ft. (.9m), 10 ft. (3.05m) preferred
6 inches (152mm) for appliances<10,000 Btuh (3kw),
12 inches (305mm) for appliances >10,000 Btuh (3kw),
and<100,000
Btuh (30kw),
36 inches (.9m) for appliances > 100,000 Btuh (30kw)
6 inches (152mm) for appliances <10,000Btuh (3kw),
12 inches (305mm) for appliances > 10,000
Btuh (3kw)
and<100,000 Btuh (30kw),
36 inches (.9m)for appliances > 100,000 Btuh (30kw)
Must conform to
CSA B149.1-10, Sect. 8.14.
(30cm)
ST-A1194-18
FIGURE A
Venting
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